Default Email Address

I think there is a difference between sharing a file or sending a file via email.

When you say sharing a file, do you mean sharing a hyperlink that you paste in the email body of your message, and when the user clicks on that link it downloads a copy of the original file from the Adobe Document Cloud (or another Cloud space service)?

OR,

When you say sharing a file via email, are you referring to the action of sending an email attachment with your email message, in which case the email recipient can click on and download to their computer straight from their email inbox?